§18 声音的概念及分类物体振动后,激起周围媒质(如空气)的波动,在听觉器官上起作用,通过听觉神经传达给大脑而产生了声音的感觉。物体振动的形式是多种多样的,有的沒有规则,呈非周期性振动,所产生的声音沒有一定的音调和高度,称为声。有的有规则,呈周期性振动,所产生的声音常常有一定的音调和高度,称为音。亦即无调的音称为声,有调的声称为音。声和音在声学中各有 § 18 Concept and Classification of Sound The vibration of an object causes the surrounding medium (such as air) to fluctuate, causing it to function in the auditory organ and produce a sense of sound through the auditory nerve to the brain. Objects in the form of vibration is varied, and some are not regular, non-periodic vibration, the sound produced by a certain pitch and height, called sound. Some rules, periodic vibration, the sound produced by a certain pitch and height are often called sound. That is, the toneless tone is called tone, the tone is called tone. Acoustic sound and sound each have